SPIB Resource Monitoring Program

In the early 1990’s, new lumber design values were approved for all major softwood lumber species in North America. This testing program was known as the “In-Grade Testing Program” because each piece of lumber tested was required to be precisely of the grade being tested. The design values were based on tests of full-size pieces […]

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Determining Design Values for Lumber

Recently, we shared a blog discussing the various types of lumber strength properties. These are important for engineers to use to design structure with wood. But where do the lumber design values come from? The process of determining lumber design values has evolved over the years.

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